/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.phei.netty.ssl;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.handler.ssl.SslHandler;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import io.netty.util.concurrent.GlobalEventExecutor;

import java.net.InetAddress;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Handles a server-side channel.
 */
public class SecureChatServerHandler extends
	SimpleChannelInboundHandler<String> {

    private static final Logger logger = Logger
	    .getLogger(SecureChatServerHandler.class.getName());

    static final ChannelGroup channels = new DefaultChannelGroup(
	    GlobalEventExecutor.INSTANCE);

    @Override
    public void channelActive(final ChannelHandlerContext ctx) throws Exception {
	// Once session is secured, send a greeting and register the channel to
	// the global channel
	// list so the channel received the messages from others.
	ctx.pipeline().get(SslHandler.class).handshakeFuture()
		.addListener(new GenericFutureListener<Future<Channel>>() {
		    @Override
		    public void operationComplete(Future<Channel> future)
			    throws Exception {
			ctx.writeAndFlush("Welcome to "
				+ InetAddress.getLocalHost().getHostName()
				+ " secure chat service!\n");
			ctx.writeAndFlush("Your session is protected by "
				+ ctx.pipeline().get(SslHandler.class).engine()
					.getSession().getCipherSuite()
				+ " cipher suite.\n");

			channels.add(ctx.channel());
		    }
		});
    }

    @Override
    public void messageReceived(ChannelHandlerContext ctx, String msg)
	    throws Exception {
	// Send the received message to all channels but the current one.
	for (Channel c : channels) {
	    if (c != ctx.channel()) {
		c.writeAndFlush("[" + ctx.channel().remoteAddress() + "] "
			+ msg + '\n');
	    } else {
		c.writeAndFlush("[you] " + msg + '\n');
	    }
	}

	// Close the connection if the client has sent 'bye'.
	if ("bye".equals(msg.toLowerCase())) {
	    ctx.close();
	}
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
	    throws Exception {
	cause.printStackTrace();
	logger.log(Level.WARNING, "Unexpected exception from downstream.",
		cause);
	ctx.close();
    }
}
